Another interesting thought- according to the bass guy at gelb music, two hd112s sound identical stacked to the hd212- however- stacking two cn112s doesn't sound identical to the cn212. I didn't hear it so I'm just passing along the music stores opinion- and honestly I trust his opinion- he's a player and the main buyer. To be honest I can afford the rig I want and I went in wanting one thing but trusted my ears and walked out with something different.
I A/B ed a C/N 212 against 2, CN 112's, and they do not sound alike. Bass and Beyond has a video comparing the two, and there you can hear the differernce. To my ears and many others, 2, 112's has more bottom, and more lower mid push than the 212. When I compared them at Bass Specialties, other players were around, and we all agreed that the 112's had more bottom. The CN 212 is more even across the frequency board. Though it cost more, I went with 2, 112's.